Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6c4ff9577a7ad7…

MALICIOUS

PDF

89.5 KB Created: 2021-09-21 01:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 79419fa6108aafb78b374222a990ac4c SHA-1: 297378e80eb2e1f2e2d2f527f83cbe756b68faf9 SHA-256: 9a6c4ff9577a7ad705a62974403303314189e0631c92e1c93d58a9895131f799
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://esejsc.com/upload/files/pajunepamimatafenijux.pdf In PDF document text
    • http://jl-vacuum.com/upload/files/29221575451.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7e3000321---lavotidukuridira.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/66571511288.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/3444901174.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/maxejilasowowo.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/f0068a796a5b2aff298e805e1a1f6ebe/61304326072.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/wokakimejaferizeniga.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/nijipepoterakapa.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/23509732483.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/bidujik.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4d528b237---telorujetidomijugero.pdfIn PDF document text
    • http://c-amc.com/upload/files/zuwaxovumasepig.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16144f3c7efed3---51887371217.pdfIn PDF document text
    • http://elma1.ru/!upload/files/30298441244.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/melobonus.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/18753755367.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/badukoxovilu.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/xuboroxagez.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210904_104847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=good+movies+on+cinema+hdPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFC 17228 bytes
SHA-256: 4e6ecbe85584c859088a17af0dbe1657d4717df775a92ff022ea5f99052af11a
font_01_sfnt_off000129b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B8 10496 bytes
SHA-256: bc899c93517ed530b91a03203506a8ef0c4ecbd12d5bf44147ba656a4fffad22
font_02_sfnt_off0001416f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1416F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1